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Commercial Propulsion Engines

Industry-leading technology allows Caterpillar to create the most reliable commercial engines for a variety of applications. From tugs and container vessels to yachts and sport fishers, Cat and MaK engines have demonstrated their efficiency countless times. With remarkable reliability and durability, these engines will exceed your expectations for decades.

3406C Propulsion Engine

The mechanically governed 3406C marine propulsion engine is available “A” rating of 365 bhp (272 bkW) and a “B” rating of 400 bhp (298 bkW).

  • Specification Summary

  • Power Range 365-400 bhp (272-298 bkW)
  • Speed Range 1800 rpm
  • Aspiration TA
  • Configuration In-line 6, 4-Stroke-Cycle Diesel
  • Specification Sheet

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Product Details

Power Rating

Power Range 365-400 bhp (272-298 bkW)

Engine Specifications

Speed Range 1800 rpm
Emissions Non-Certified
Aspiration TA
Bore 137.2 mm
Stroke 165.1 mm
Displacement 14.6 L
Rotation (from flywheel end) Counterclockwise
Configuration In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

Minimum Dry Weight 1325 kg
Minimum Length 1454.2 mm
Minimum Height 1278.5 mm
Minimum Width 913.5 mm
  • Exhaust System
    •  Manifold & Turbocharger, watercooled
    •  152 mm (6 in) round flanged outlet on 1800 rpm
    •  Elbow, dry, 152 mm (6 in) on 1800 rpm
    •  Flange, dry, 152 mm (6 in) on 1800 rpm;
  • Manifold & Turbocharger, watercooled
    • 152 mm (6 in) round flanged outlet on 1800 rpm
      • Elbow, dry, 152 mm (6 in) on 1800 rpm
        • Flange, dry, 152 mm (6 in) on 1800 rpm;
          • Air Inlet System
            •  Aftercooler core, corrosion resistant coated (air side)
            •  Air cleaner, Regular duty, dry, panel type with service indicator.
            •  Turbocharger inlet, 152 mm (6 in) OD straight connection
          • Aftercooler core, corrosion resistant coated (air side)
            • Air cleaner, Regular duty, dry, panel type with service indicator.
              • Turbocharger inlet, 152 mm (6 in) OD straight connection
                • Control System
                  •  Governor, Hydra-mechanica
                • Flywheels & Flywheel Housings
                  •  Flywheel, SAE No. 14
                  •  Flywheel housing, SAE No. 1
                  •  SAE standard rotation
                • Flywheel, SAE No. 14
                  • Flywheel housing, SAE No. 1
                    • SAE standard rotation
                      • Fuel System
                        •  Fuel filter, Spin on, LH
                        •  Fuel transfer pump
                        •  Fuel priming pump
                        •  Flexible fuel lines
                        •  Fuel ratio control
                      • Instrumentation
                        •  Instrument panel, LH
                        •  Engine Oil Pressure gauge
                        •  Engine water temperature gauge
                        •  Fuel pressure gauge
                      • Lube System
                        •  Crankcase breather
                        •  Oil filter, Spin on, RH
                        •  Oil filler in valve cover and dipstick, RH
                        •  Oil pump, sump, manual
                      • Crankcase breather
                        • Oil filter, Spin on, RH
                          • Oil filler in valve cover and dipstick, RH
                            • Oil pump, sump, manual
                              • Mounting System
                                •  Front Support
                              • Cooling System
                                •  Oil cooler
                                •  Thermostats and housing, Full open temperature 92 C (198 F)
                                •  Jacket water pump, gear driven, centrifugal
                                •  Auxiliary sea water pump, gear driven, rubber impeller, rotary, self priming (heat exchanger engines only)
                                •  Expansion tank
                                •  Marine transmission oil cooler
                              • Oil cooler
                                • Thermostats and housing, Full open temperature 92 C (198 F)
                                  • Jacket water pump, gear driven, centrifugal
                                    • Auxiliary sea water pump, gear driven, rubber impeller, rotary, self priming (heat exchanger engines only)
                                      • Expansion tank
                                        • Marine transmission oil cooler
                                          • Starting/Charging System
                                            •  Charging alternator
                                            •  Electric starting motor, LH
                                          • General
                                            •  Vibration damper
                                            •  Lifting eyes
                                            •  NOTE: Engines for keel cooling do NOT include keel cooler. Engines for heat exchanger cooling do NOT include heat exchanger.
                                          • EXHAUST SYSTEM
                                            •  Elbow
                                            •  Rain Cap
                                            •  Flexible Fitting
                                            •  Muffler
                                            •  Duplex fuel filters
                                            •  Water seperator
                                          • Elbow
                                            • Rain Cap
                                              • Flexible Fitting
                                                • Muffler
                                                  • Duplex fuel filters
                                                    • Water seperator
                                                      • CONTROL SYSTEM
                                                        •  Engine mounted controls
                                                      • COOLING SYSTEM
                                                        •  Head exchanger - shipped loose
                                                        •  Dry charge coolant conditioner
                                                      • Head exchanger - shipped loose
                                                        • Dry charge coolant conditioner
                                                          • LUBE SYSTEM
                                                            •  Sump Pump
                                                          • STARTING SYSTEM
                                                            •  Ether starting aid
                                                            •  Battery Sets - 24 Volt - Dry
                                                          • PACKING
                                                            •  Engine Protective Cover
                                                            •  Storage Preservation
                                                            •  Export Packing
                                                          • Engine Protective Cover
                                                            • Storage Preservation
                                                              • Export Packing
                                                                • GENERAL
                                                                  •  Tool set
                                                                Built for it